It's a lovely little tool, cute as a button and works beautifully, but if they're both flat bottomed shaves then it won't extend your capabilities all that much. It will handle a slightly tighter inside radius than the Boggs, but a round bottomed shave will go much tighter still. Being bronze some makers say it can leave marks on pale timbers, never experienced that personally but I've heard it more than once from knowledgeable craftsmen. If you want to work end grain you'll find a good low angle shave will be much less chatter prone, if you want to precisely set the blade for wider cuts (i.e. you don't want to "****" the blade so it's deeper on one side than the other) then a good adjustable shave is useful.
A couple of decent spokeshaves are absolutely core tools for virtually all woodworkers, and it's true that some of the worst tools ever made were the cheap shaves from the "shoddy 70's", but unless you're going to become a spokeshave collector it probably makes more sense to get the widest range of capabilities from the fewest number of tools, and a flat bottomed Boggs plus a flat bottomed bronze LN doesn't really achieve that.
Good luck!