Same sizes not matching

[Photomadd]

I have an image 20cm h x 118.3 cmw @ 300. When I click Command N to make a new blank image of exactly the same size, although the new image has the same specs (and old & new blank image both 8 bit, the 2 images are NOT the same size (????).

When I move the 1st image onto the blank new image, tmy photgraph falls onto the new image way smaller.

I cannot work out what is going on. Can anyone help please?

[Per Berntsen]

You have set resolution to 300 pixels per centimeter in the new image, which equals 762 pixels per inch.

Change it to 300 pixels per inch.

[Photomadd]

THANK YOU!!! Didn't notice. Never happened before in more thqan 20 yers digital. Who knows why, but right now - just thanks.

[Photomadd]

So I went to my preferences & there it was. Units & rulers had somehow become pixels/inch. (I have been having some hardare issues). Anyway, I changed it & all good now & I also inderstand what was happening.

So appreciate your response.