Ramiee,
Pro Evolution Soccer 2017 requires firmware 4.75 and accordingly has signed keys from 4.75.
You will not be able to re-sign it for 4.70. EBOOT.BIN can not be modified for OFW.
You can only try to lower the firmware version in PARAM.SFO with the hope that the game itself can be signed with keys 4.70.
Firmware 4.70 can not have keys from 4.75 in any way, because it can not know this