Can PSoC4 CY8CKIT-042 Pioneer kit be used as debugger for PSoC4 and PSoC5 both?
PSOC5 kit- CY8CKIT-059 include kitprog, if you really want save money, you may use one CY8CKIT-059 program and debug PSOC4 and PSOC5.
Can PSoC4 CY8CKIT-042 Pioneer kit be used as debugger for PSoC4 and PSoC5
Not without modifying the pioneer kit with a soldering iron. This is why we suggest you to use a -059 prototyping lit, the snap-off part is a complete programmer.
Bob replay is correct.
Beside this, for some reason I did damage my pioneer kit Kitprog parts.
Use MiniProg3 is better, it can protect damage.