I would like to know also, since I think that they have the same pups, and have been interested in getting a 245. I have the SE ZM, and was about to try a very nice looking SE 245 today, but someone else bought it before I got to try it.
I really like the SE ZM, the wide/fat satin neck feels great, and the SH body gives it a nice "airy" tone, and I can easily get some terrific, controllable, moderate feedback. The guitar really has some great sounds, both clean and driven.
I'm thinking there will be a noticeable difference between the two, being a solid body, solid bridge on the 245 vs the SH body, adjustable bridge on the ZM. I think I've decided that the SE 245 Standard would be a nice choice.