Neither of the two Ebay postings actually say Common Positive. That is what you need to be directly compatible with the MR16.
I have LOTS of RGB 5050 ribbon and every one has been Common Positive. At the cut points, they always show 4 connections (+12, R, B, G) If is says +12, then it is Common Positive. The order of R G B may change, though.
How were you planning to wire these to your MR16? The reason I ask is that I tried stripping back the waterproof layer and soldering to the copper pads but had very low strength joints (as in lots of failures once I moved things).
If soldering is your plan, try to mount them permanently before soldering. There are "clamp on" style connectors that you can try.
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LoginI have some of these and they work well. You still have to peel off the waterproof layer, then slide the strip in under the metal fingers, then close the clamp.