BPC 7.5 NW Client backward compatability

Hi Experts,

Is BPC 7.5 NW Client backward compatable to BPC 7.0 NW Version? we have installed BPC 7.5 NW sandbox system and install client 7.5 on user system but when try to use BPC 7.5 client with BPC 7.0 NW systems giving lot of problem. any idea?

thanks

Venkata