First Time Using GIMP. Need Advice

[marlia7568]

I have two maps of London that I want to merge them into one. The problem is, the maps are not quite aligned to each other and it vexes me to no end on this problem. If you guys know how to do this, please help me. Thanks you for reading.

Here are the files: 
North: https://drive.google.com/file/d/11bjtVb0...drive_link
South: https://drive.google.com/file/d/1Gap1VH0...drive_link