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говорить на разных языках stresses
gen.	speak different languages; not speak the same language; be speaking different languages; be on different wavelengths; be on a different wavelength (Дмитрий_Р)
Gruzovik, inf.	not to speak the same language
idiom.	talk past each other (Manookian)
Makarov.	be at cross-purposes with (someone)
rhetor.	speak a different language (Alex_Odeychuk)

говорить на разных языках: 4 phrases in 2 subjects

General	2
Makarov	2