As atlys spartan 6 development kit has N15, P17, N18 and P18 USB HID pins for keyboard and mouse,
What are the equivalent pins in SP605 board?
None. The SP605 doesn't have USB host capability. You could add a PIC24 (as used on the Atlys) with appropriate programming and plug that into the User SIP Header on the SP605 to replicate this behaviour, if you wanted to.