When we booked our Alaska cruise for 2019, we worked from the Holland America physical guide "2019 Alaska & the Yukon - Land+Sea Journeys". This has been the only place we found what land tours are included in which Land/Sea tour. We booked D5C - 11 Day Double Denali, because we wanted to do the tour into Denali. On page 34 of that guide there is a chart of Journey Features cross referenced with Journey numbers. For example, the chart for D5 shows Tundra Wilderness Tour in Denali and Riverboat Discovery in Fairbanks as included. The Tundra Wilderness Tour is shown as included in D1 through D6, which are the Double and Triple Denali Tours. D7 through D9 only have one night in Denali and do not include the tour.
The code D5C is made up of D for Denali, 5 is the Land itinerary number and C for Cruise first (Cruise, do the land itinerary, fly home from Alaska). D5L is Land first (Fly to Alaska; do the land itinerary in reverse; cruise).
Of the Double and Triple Denali Journeys, all of them except one end/begin in Fairbanks. That one is D6C/L. It has a long train day from Denali to/from Seward. You fly in/out of Anchorage. We wanted to visit Kenai Fjords National Park, which is accomplished by an excursion on debarkation day in Seward and transfer to Anchorage, which works with a D5C itinerary. We didn't have any strong desire to visit Fairbanks, but the itinerary worked best for us.