Bilge Pumps

[Fishtales]

I replaced the forward pump a couple of years ago, it was quite smaller than the previous pump with a greater capacity. I was a bit skeptical based on size, but am impressed at how well it works.
I decided to change the aft pump this year, it was a 1700 gph. I wanted to stay with the same exit hose diameter to make it easier. I found the exact pump (brand and capacity) and it too is much smaller.
Curious if folks noticed this? I'm thinking it is technology advances for the improvement. Thoughts?

 

[Sailfish]

My guess is the "pump" is the same size, and all of the other components have gotten smaller.

 

[seasick]

Depending on how old the old pumps were, yes technology has changed and would mean a smaller package for the same ratings