Do cartridge BB's have both ends removeable? Apologies if this is a dumb question!:

I am teaching myself some bike maintenance skills and was removing my crank and BB.  However, the ParkTools videos I've been following show BOTH ends of the BB cartridge having a cup to remove.

When I tried the same on mine, I could remove the non-chainring side, and then remove the entire cartridge through the chainring side.  I don't know if the cup should be removable, or do some have them built in.

This is all the info I can find on the cartridge and I couldn't find any writing on the cartridge itself:
Bottom Bracket - VP square taper, 73mm shell, english thread
Most of the standard square taper bottom brackets on the market (e.g. Shimano BB-UN54/BB-UN55) have one cup permanently attached to the bottom bracket (usually drive side) and the other one removable.

However, some manufacturers make ones with both sides removable (e.g. Phil Wood) and some other variations on installation (notably threadless ones like the Velo Orange Grand Cru Universal).