In my experience, it seems that some stuff jives between the scales and obviously some stuff doesn't. You can sometimes get away with putting 1/24 scale wheels/tires under a 1/25 car and vise-versa. Another thing that comes to mind is when I used some 1/24 scale small block Chevy valve covers on a 1/25 scale car and it ended up looking like a big block which is what I was shooting for. So, the best advice I can give ya is just to try stuff out. If it looks good, roll with it.