yes brother,you can mix both test cyp and test eth,they are both nearly identical,they are both long estered and not really much difference in them except they are in different kinds of oil,but thats it,they last as long as each other,and you will never know the difference,you will need to run 500mg/week for 12-14 weeks for your cycle and you will need either some torem,clomid and nolvadex to take after your cycle to restart your own testosterone production