I don't think the similar ending is really that noticeable; I didn't notice until you pointed it out.
Laurie as a nn for
Laurence would be pretty rare, it's fairly archaic nowadays. So you wouldn't really have to worry about "
Laurie and
Maurie" unless you purposefully introduced them that way. Something like
Larry and
Moe could be fun, but then that's getting into Three Stooges territory... Just make sure you don't have a third brother called Curly.
Maurice and
Laurence suit each other. Very Edwardian!
Laurence is such a handsome name, and it's nice to see
Maurice getting some attention! I think
Maurice is very cute.
If the similar endings trouble you,
Maurice &
Laurent would be beautiful and a bit different.