Upgrade Vanguard 18 hp to a Vanguard 23 hp??

I have a Grasshopper 718 that just blew a Vanguard 18 hp motor. I was going to purchase a new Vanguard 18 hp motor but thought I might just upgrade to Vanguard 23 hp for around $150 more. Two questions: Is it worth upgrading to a bigger hp motor?? Will upgrading to a 23 hp motor hurt anything else on my mower??

Thanks ~ Dave