As 'inspiration' for their plan? Keep in mind you got a plan where the displacement proposal read out differed from what he told you verbally as to the drop downs associated with anterior and posterior maxilla. Surgeons generally don't mind if you show them the other guy's plan unless you come off as THEY should be 'inspired' by it. Just say something like: 'I brought along my prior proposal if you would like to see it.'
If you did pay for the implant design for the jaw implant, assuming you have the 'directions' for manufacture, I guess you could show them that. However, they might use a different design engineer given that the prior surgeon owned/was sole proprietor of the implant company of your prior design whereas the company with a long track record of custom implant designs and also custom plates is called 'Materialize'.