I can't speak for amphenol specifically, but i've used Arista and Intel qsfp28 breakouts on my SN2700 without problems, mellanox switches aren't picky about vendor coding.
The only thing I would note is that if you are using a QSFP28 to 4 SFP28, it will switch over lanes from an adjacent port, so when I set my 1/29 port to breakout to 4 sfp28, port 1/30 became completely disabled.