Even if you can’t find a boat like your’s on there, you can usually find similar boats and compare them. Obviously not ideal, and the rule doesn’t always hold true, but you can probably use those performance differences as a guide for how they would compare on your rig. For example, I found that they tested the 175 SHO, I4 200, and V6 200 on fairly similar G3 boats. I’ll post links, but they were all roughly 19′ boats that weighed 2900-3100lbs, give or take. It looks like the V6 200 doesn’t justify itself very well, although I would bet that it would feel a lot more “responsive” when you’re advancing the throttle, or going from mid-range to WOT. So a little “sportier”, if you will? I think since you’re adding 200lbs or so of weight, most of the performance would be wasted on that. However I know almost every guy I’ve talked to that’s ran both 4 and 6 cylinder versions of a motor prefer the 6. The 200 I4 is slightly faster than the 175 SHO, but it looks like the SHO is generally a bit more fuel-efficient. As with a lot of this kind of stuff, it’s mostly minor differences, you just have to decide where you want to draw the line in the sand.
https://yamahaoutboards.com/en-us/home/outboards/v-max-sho/in-line-4/vf175/pb_g3b_anglerv19f_vf175xa_2017-07-09_alm
https://yamahaoutboards.com/en-us/home/outboards/350-150-hp/in-line-4/f200-i4/pb_g3b_anglerv192sf_f200xb_2014-04-08_alm
https://yamahaoutboards.com/en-us/home/outboards/350-150-hp/v6-3-3l/f200/pb_g3b_anglerv185fs_f200txr_2011-06-15_alm