Passenger Side CV Axle replacement wobble/shimmy at lower speeds?

I watched your video replacing the driver side. Best video by far on YouTube for that job, I am replacing the passenger side to fix a clicking sound. Bought an inexpensive aftermarket axle and within 2 weeks I got a wobble/shimmy at lower speeds. I just got a low mileage OEM axle from a junkyard. It came as a complete unit (trans unit to axle nut) while the aftermarket was from the bearing/bracket to the axle nut. Can I separate the complete unit and just replace the outer portion, or should I replace the whole thing? I would rather not pull from the transaxle if I don't have to so I won't lose any fluid. Thanks again for all your videos and for your time in answering my question!