Shimano STI - ST7800 v. ST7801

Can someone explain the difference between Shimano STI Dual Control Levers ST-7800 and ST-7801? I’m obviously surfing eBay looking to replace 6yo shifters on my road bike (upgrade to 10spd).

What I found on the Performance site for the 7801 –

"5mm smaller grip circumference and cradle-style perch are designed to enhance grip and comfort "

So I assume that the 7801 is smaller than the 7800.