From the Publisher's Website:
4K X-Maps are actually two products in one. X-Maps bring the Lock ‘n Load Tactical series games to a grander scale, with a substantially larger playing surface and hexes that are nearly double those of the standard maps. In comparison, X-Maps are 11” x 17” as opposed to the 8.25” x 12.75” standard maps.
What Does the 4K Element Add?
4K adds to our X-Maps in many ways starting with our new map style that uses a much more minimal hex grid design. It also includes more custom map terrain and buildings giving each map its own style. We also use a much more minimal hex grid design that shows less hex grid and more map. You will, of course, receive all the original maps that are included in the game (Heroes of Normandy as an example) and some additional maps all in this new style. Some of the scenarios require you to pretend certain terrain or features of the map are not there or are to be exchanged with other types of terrain. A scenario might say "All fields are to be considered Clear terrain etc." For those scenarios, we have made new maps that already have the terrain changed. We also have a list of the scenarios that states which map to substitute, allowing the player to be more immersed in the game. These maps are NOT needed to play your games but are an enhancement for them.