Pensions can be transferred between the CFSA and PSSA; you can only accumulate 35 years of pensionable service total for the Government of Canada, CF/Public Service/RCMP combined.
Note that for Reservists, only pensionable service under part I (the Reg F plan) is transferable; service in under part I.1 of the CFSA (Reserve Force pension plan) is not transferable to the PSSA, but does not count against the 35 year limit.
Pay depends on classification, as previously stated, but there are provisions to enter at the pay incentive closest to or higher than your current military pay. If the public service position pays less than your military position, you will enter at the maximum incentive for your PS position.