My shop has 11' ceiling while my garage only has 10. Because the shop sits behind the house and the house is up a hill from the street - no one ever even notices the shop is back there. The roof lines are off a foot, and the ceilings obviously don't match. Both have the same pitch roofs and eve overhang.
Blending or not blending has more to do with being similarly constructed, sided, and roofed than having the same height or proportions.
The one thing you might need to watch out for is some codes don't allow accessory structures to exceed the height of the principle structure (dwelling). That's the one that can bite you if you have a single story house with a relatively low pitch roof.
I got away with it because the garage side of my house has a lower roof than the other side of the "L" which is 32' wide instead of 24' like the part that meets up with my shop. So the roof on the front part of the house is 18" taller which gives me the extra foot I needed.
My shop is 11' ceiling because I wanted an 8' hook height for my bridge crane. The I-beam, trolley, and hoist take up a lot of room.
Feel free to ask any other building questions. I learned a lot by building my shop myself.