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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7 Plank Wagon 'Kingsbury Collieries Limited, Tamworth'
RTR 9ft 7 Plank Open Wagon - Small & sons
SR 25T 'Queen Mary' Brake Van BR Departmental Olive Green
9ft 7 Plank Open Wagon, James Beswick
9ft 5 plank open wagon Logan & sons
9ft 5 plank open wagon Teign Valley Granite
BR "Conflat P" No.B933521 (with bauxite containers)
BR "Conflat P" No.B933417 (with crimson & bauxite containers)
BR "Conflat P" No.B933061 (with crimson containers)
9ft 7 plank open wagon "Newbattle"
9ft 7 plank open wagon in 'London Brick Company and Forders Ltd' black