I don’t want to major in the minors, but I also don’t want to make changes to the program if there a reason for it. Hopefully this is a relatively simple question…
In my experience the 5x10 is where the Big part of Boring But Big comes from. So if you split DL and Squat you are going to be too fresh for each exercise and not do enough volume for the GAINZ you want. Give the 5x10 squat a try at 70% of your training max. They absolutely suck! So I doubt you could come anywhere close to accomplishing what BBB sets out to do by mixing up the 5x10 hypertrophy sets.
Wendler gives two basic templates for BBB. One with 5/3/1 sets + same move 5x10 OR 5/3/1 sets + corresponding movement (e.g. deadlifts after squat, overhead after bench and vice versa). Either is fine, IMO.
If 5x10 @50% doesn’t do it for you, do 5x10@55%, or 60%. Find YOUR groove. Do the program as written, but you can mix up the BBB percentages based off your strength and recoverability. EAT.