Here is the Household with the Domestic front plate -
Household with Household
Domestic with Domestic. The Household plate would not even go on the Domestic, but I had to polish the replacement Domestic plate I bought before it would fit this machine too, so the plate being slightly too wide may be a fitting issue and not actually a different size.
And though it looks the same, the feed dog opening is slightly different so the needle plates won't interchange either. I also have a third oval needle plate with a very different feed dog opening.
And for fun - the newer and older style National/Eldredge shuttles. They are the same except for the length.
I took the pictures a week ago and wrote down the measures - somewhere . . .