HTTPS on and SSL sign and encryption OFF

HI,
We are using Https protocol for exchanging messages with partners.
due to some problems with ssl certificates we made sign and encryption off with some partners . and it worked fine.

now we want to test new certificates with some partners with ssl certificates sign and encryption on .

Will there be any effect on the partners who are using https protocol and ssl certificates sign and encryption off, as they are not aware of this acitvity.

Thanks,