Hard to say without seeing the configuration, you're saying that the back of the old bucket is less than a 90 deg. angle and the new one is closer to a 90 deg. angle. My assumption on this is that the old one as configured would have more of a range for dumping, less when curled back, so if you shorten the distance by using the one that is closer to 90 deg, you would have less of a range when dumping and more range when curling back. I would surmise that the distance of the difference of both angles is what you are looking for, and how it changes when you use those mounts on the new bucket. It sounds negligible, because the angles of the back of the bucket are so close, but I would guess that you could equalize that distance that you determined is between both angles, possibly by adjusting the mount up or down as the bucket pivots. Take some measurements, do a little math, see where the bucket needs to be in it's radius as it pivots on the loader arms, to be the same as it was, mark it off and just tack the mounts, put the pins in and see how it works, if good, complete the welds if not, make the necessary adjustments, not sure if you have the float function on your hydraulics or anything that flattens the bucket, probably too old, but if you do, it would be wise to see how the mount locations effect that, although thinking about it, maybe the float would be a function of the loader arm cylinders, not the bucket cylinders, just thinking aloud here, hopefully this makes some kind of sense. I have considered similar things, have a larger bucket that would be great for snow and light materials, that I could easily mount quick tach mounts onto, but like I mentioned, I would tack it first and move it through the complete cylinder range, then you know, before it's completely welded on. The other thing that I find is important when you have a bucket that really curls back is having a good size spill shield, extra steel on top of the bucket to hold the load in place, it can be so annoying to load the bucket from the pile, curl it back and have a good amount spill off the back, or fall off while traveling. I usually settle the load in the bucket before moving anyway, but if you are working anywhere those little spills need to be cleaned up, the right configuration, spill guard, and a careful operator certainly can save a lot of hand work.
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