Pantile roof

[NoNameNoNumber]

I need to replace a few tiles on our ~25 year old house. An old flue pipe needs to come out.
1, do I just find some pan tiles that look close colour wise and assume it as likely they’ll fit or do I need to remove one to take to a merchant?

2, I guess they just push up to unhook them? Or is there a nack?

 

[ANDARIAL]

some rows will likely be nailed,if the tile wont budge try another row
best to take one with you
BUT some tiles have make and model stamped on the back

 

[NoNameNoNumber]

Ah stamped info would be good.
Thank you.