I would also consider the door from mudroom to garage to be an interior door and would want it to match the other interior doors. It would drive me crazy to look at the space and see a different door!

All my doors are 3-panel except for my front door.

Any door leading to the outdoors in my house is different than any interior doors. In fact my front door and the door leading to my driveway (I'm on a corner property) both are painted red on the exterior and interior while all other doors are white.

The door from the garage into the house is the same as my interior doors.

IMO all interior doors the same is anice look and the mud room for you needs for sure to have all the same doors. I also do not like solid doors with not glass for entry doors All my interior doors in my MCM home are pixelated glass and my 2 doors that allow entry and seen togethr are the same exterior door with no pixelated glass just simple glass but all the same frame .

In my mudroom I have two 2 panel doors (garage and outside door has a window) and one 5 panel door (laundry). They are visible from the kitchen (I can actually see them from where I sit right now) and it's never bothered me that they are different.

Thank you everyone! i called an upgraded the fire soor to two panel. I was trying to save money because I am shell shocked over the kitchwn upgrades. thanks again!