why are 1/4 wrot copper tees bigger than 5/16 ones? Is this correct?

From grainger:

1/4 tee: https://dpk3n3gg92jwt.cloudfront.net/domains/grainger/2dpdf/grainger-5p095.pdf

5/16 tee: https://dpk3n3gg92jwt.cloudfront.net/domains/grainger/2dpdf/grainger-39r496.pdf

I'm trying to find parts for my appliance repair work and this just doesn't seem right... Can someone who knows please help me with this?

TIA!

submitted by /u/midnightsnackerrehab
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