Replacing internal door with external door

Hi all,

Im totally new here and know a little to nothing about door (at this stage).

Im thinking to replace my internal door (access to house from garage) with an external door. I have did the frame and door measurement and compare it to my main entrance external door, they both have the exact the same measurement, is that mean there shouldnt be a problem to replace the current internal door with an external door?

Reason being I have recently purchase property and the existing garage entry internal door is 35mm and has scratch all over it, and I wanna install a digital lock that required a minimum of 40mm door thickness.

Thanks

isn't it going to stick out from the door frame by those extra 5mm?

Seems a good move, more secure and better fire resistance,

Depends what sort of frame it is. The majority of metal frames will fit a 40mm door. If it's a timber frame then it may not fit. It's easy enough to measure the door rebate.