I currently have some mono versions from other countries.
I can't say for sure, but they are probably bootlegs. I have to say that they have amazing sound quality and many have slightly different mixes than the stereo versions. The Beatles, themselves, were only concerned with the mono mixes and did not get involved with the stereo mixes. They actually would have preferred their work to be mono only. EQ, reverb,and echo were heavily used in the stereo mixes, but not the mono mixes. I have ordered the mono set and will also buy the stereo set. What I find strange is that they are not issuing mono remasters of The White album and Abbey Road, which I have in a mono version.