It depends entirely upon how fast you push the boat. A high hp engine has the ability to push the boat faster but if the boat is pushed at a bit less than theoretical hull speed then the high hp engine and the low hp engine will use approx. the same fuel. Yes, the high hp engine will use a bit more but likely only a few %.
Keep this in mind; for a given hull run at the same speed it takes the same hp regardless of the engine as long as either engine is adequate to reach the same speed.
Your 37 hull likely has a waterline length of 34'. Using the formula of
WL length square root x 1.34 yields a hull speed of ~ 7.8 knots.
sq.rt 34 = 5.83 then 5.83 x 1.34 = 7.8.
At that point [7.8] the hull will start trying to climb the bow wave which then becomes fuel use heavy.
In fact that speed will not result in the best economy. Rather somewhat less, maybe 7- 7.25 knots.
Use that formula for ANY boat.
There are all kinds of variations of hull shapes which will change the formula somewhat but it works to get an estimate. Some boats will travel a bit faster, some slower but in that range predicted. It's a guidline only.
I will guess that if you follow a guidline like this the engine will use ~ 2-3 gph at 7 knots. On a personal thought I think at 7K this hull would be in the area of 2.5 - 3 gph. Only trials will zero in better than that.
At these speeds the engines do not use a lot of fuel even though the capable power is much higher.
This would have applied to the 41 also, just the hull speed would be somewhat higher and maybe a bit more fuel.
However, note, push that hull speed hard or past it and the fuel use WILL climb, usually sharply.
With any of these boats, when running, if you detect a noticeable bow rise and see a good size rolling wave following you are pushing into higher fuel use.
Of course substantially larger vessels will use more fuel than I am talking about here but this should stand for most vessels in up to the 42 or 45 ranges adding a bit more fuel to account for the larger hull and weight.
There will be other explanations, better than mine, but this should get you started.
Let the arrows fly.