Whether the mt-languages of mt3 and mt4 are compatible ?

 
I find in mt4, the help file( tools >metaquotes language editor > help > help topics) is in russian.
But I don't know Russian, so I wan't to learn mt language from mt3.

So, can anybody tell me whether the mt-languages of mt3 and mt4 are compatible ?
 
no. MQLII and MQL4 are incompatible.
MetaEditor dictionary written on english only (in russian written help for MetaEditor not for programming language)
see also https://www.mql5.com/en/code