Hello everyone! I am new here!
I am from China ,and my English is not good......
No discussion about the difference between the export version and the Russian service version. Just talk about the appearance:
There are two kinds of the T-90 turret: the cast version(from T-72b),and the welded version(improving from object 188 turret).each version could have two configurations:with SHTORA jammers or with additional ERAs,and here are some pictures:
welded turret with additional ERAs
cast turret with additional ERAs

welded turret with SHTORA jammers

cast turret with SHTORA jammers

Current missile use varaable wavelength,so the SHTORA jammer is not very effective,and it occupies the most space for the turret protection,so the additional ERAs is a good substitute.
thanks for correct me! And sorry for poor English