Old one left, new one right:

1.5 inch lower headset bearing for an Orbea Oiz, purchased from ebay.

All dimensions the same, apart from the tapered section on the new one being fractionally deeper.

Ta in advance.

Try it – check that does it doesn’t protrude a bit out the bottom of the frame as an exposed bearing won’t last as long, but it will still function fine. Slather everything in marine grease to stop it corroding.

Basically, yea.
The 45 degree bit is up against the headtube flange, right?
So, as long as the internal diameter (hole in the middle) is the same, then it’ll be fine.
Might poke up into the headtube void a bit.

Excellent. Should be fine then, it looks like it’s sitting in exactly the same spot in the head tube.