Though many find it fun the usefulness is limited.
Everything depends on your frame of reference(s).
Can you actually relate what those fractions of an inch differences would be like?
Same for differences in weight?
Most people can't!
Several people made a huge deal about the larger size and weight of the new FN HIGH POWER compared to a classic like the SA35.
I've been shooting my BHPs constantly. SA35 is identical. Shot them side by side with the FN.
Couldn't FEEL the difference in size or weight!
My Dad was a Millwright. He had calibrated eyes. He could perceive small differences.
Some can look at a Blueprint and SEE it 3 dimensionally in their brain down to the measurements.
Some can feel and judge small weight differences.
Most of us cannot. Especially, all of it combined.
Nothing beats laying your hands on them. And if you're honest with yourself, you may find it doesn't matter. Even when you shoot them.
That's a reason i ask, how does it shoot for you?
Range Rentals are bigger today. Perfect way to compare and/or try before buying. Have a blast at the same time.