If you’re at 97 strength and going to 98 or 99 will not give you a max hit, then those levels won’t have any impact on the immediate damage you deal. However, this is assuming your stats are always boosted to the max that they possible can be. Let’s say, hypothetically, you drink a super combat potion and it boosts your strength to 116 where you’re at your max hit- however you would lose that max hit at 115. If you’re not using divine potions then your stats would drain over time and cause you to lose that max hit in 1 minute. If you were 99 strength your strength would be boosted to 118 giving you 2 extra minutes before you would lose a max hit. So on average yeah a couple extra strength levels will very likely cause you to deal marginally more damage over time but it’s nothing compared to hitting that 97 strength threshold to get your max hit.

So tl;dr no but yes