Note that independantly of the ISO 639 classifgication of Romani languages, they are **independant** ofd their written forms which vary greatly: Traditionally these languages have been used orally, witgh strong enough differences in their oral forms to be encoded separately. Its classification however complicates a lot if you take the written forms, because they have *no* standard. As well the oral languages are constantly adapted locally with the dominant language with which they coexist, so much that there are many things borrowed unformally: these broowing may be lexical (and often persist in their tradition) but also grammatical (these are much less persistant, and the same people may change these depending on where they are or travel: so beside the "pure" language spoken by the community themselsves in their own families, when they travel and communicate with others, they constantly adpt their language to other speakers, including with the various gipsy or travellers communities). It should be noted that Romanis people are very frequently multilingual, because they travel a lot across countries (that's why it is often hard for them to adopt a nationality in Europe, and why they are also often discriminated, for not adopting any national standard; still there are some Romani communities that have been settled and have stopped migrating: these settled non-migrant communities are most common in South-Eastern Europe (notably in Romania and Bulgaria, but as well in some other places much further, such as Egypt and US, where they have more or less adopted some national standards, and then started to develop a strong local dialect very influenced by the local language such as English and Arabic).
In the United Kingdom, the Romani travelers have largely settled and their inherited familial language has then adopted the local English language so much that their language initially forming a very distinct dialect has become a minority language then threatened: Welsh Romani for example is now considered almost extinct: it iinitially adopted a local form based on the regional Welsh language, but as Welsh itself was threatened and remlaced by English, the Welsh Romani has disappeared, and there remains just English with some Romani terminology more or less adapted. Angloromani also has almost disappeared as well. Now Ropmani travelers may come to Britain, but most of them are Vlax Romani or Central Romani people which may cross the English Channel only for a few months, or for temporary familial or festive or religious events (they will often come from France, Belgium or Germany).
Anyway this topic is about [rmc] (Central/Carpathian Romani): yes it is very distinct from Vlax Romani [rmy]. But it's almost impossible to assert which language it is precisely in the writtern form. As well most Romani peopl use the Latin script, but this= is not universal: the Cyrillic and Greek scripts are used as well (there was an attempt done in Russia, Belarussia and Ukraine) to develop a standard based on Cyrillic, and sometimes iot may be used for a few Romani languages: this Cyrrilic form may have been used during the USSR, where Romani people were isolated from Western Europe, but now they are in contact again with other Romani people in Romania and Turkey, and now throughout the European Union where they can travel freely: the Cyrillic script is now almost no longer used except in Western Russia where there is a significant Romani community settled since long.
(I don't know if Romani people settled in Egypt use now the Arabic script; but it is very likely to occur if they have converted from Christianism to Islam).