Bad idea unless you only have one day and it will be a long day. For starters they are about 35-45 minutes apart plus parking time. LL opens later and closes earlier than SW (in the summer) unless it's changed in the last 2 years.
I would consider them both as all day parks. Even if you were at SW at opening (8 or 9 AM) stayed for 6 hours, drive to LL, say you get there at 3 and it likely closes at 8.
We have gone to LL for the day and stopped at SW or a couple of hours before but we had SW annual passes. No way I would consider spending the admission at both places for one day. But then I like to take in everything and get my money's worth where ever I am.
Most shows at SW are repeated during the afternoon so you wouldn't get to see them all. Not all shows are on in the morning.
I love both parks, SW is my favorite, LL has beautiful grounds but my son is too old to go now. If your kids are in the under 11 group and are
Lego fans then I think LL is a not to be missed park. You can't go wrong with either - just not on the same day.
Whatever you decide to do have a great time.