Expecting third boy and need advice!

I currently have a 4yo and 3yo and am expecting our third little boy at the beginning of April. My old ears name is Jaxson and my youngest a name is Mason. My husband and I LOVE the name Greyson, we were set on it (and pretty much still am), but it was pointed out to us that it sounds too much like Mason. We have tried finding other names we love as much and so far have come up with nothing. I am almost 25 weeks along and just want to call this baby boy by his name!! Do you think the names Mason and Greyson sound bad together?