I suspect that the Cds is different and its resonating with some stray inductance somewhere in the cct.....does the ring happen when the hi side synchronous mosfet turns ON?
It could actually be common mode noise and nothing to worry about.....to check for this........attach the probe tip to the same node, but also attach the probe ground to that same node aswell.....if you still see the ringing, then it is just a "fake" ring.
How do you probe?...do you use scope probe with horrible inductive ground clip?...or do you use nice home-brew coaxial probe, and possibly with cable ferrite round it to get rid of the nasty common mode noise?
Do you have Thermal cam?...does it run much hotter (the one with the ring happening)?