Yes they will both work in the HB unit ...
You should check each to see if there is coverage for the lakes you fish ...
http://www.humminbird.com/Category/Support/Find-a-Lake/
HotMaps Platinum (US) | Navionics
The LakeMaster products have a few more charting features than the Navionics simply because Johnson Outdoors owns both LakeMaster and Humminbird ...
Rickie