Yes, it is possible mix different media-based building kits on a layout. In fact, it can add a lot of visual interest...
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Diesel 0-4-0 industrial shunterType RK 20B
204 H.P. 0-6-0 Drewry Shunter Builds a static model (non-motorised) not intended for conversion. Requires assembly and painting
Evening Star, HO/OO scale
Battle of Britain Class 4-6-2 "Biggin Hill", HO/OO scale
OO Schools Class - Harrow Kit, HO/OO scale