You’re correct. I’ll try and recall what are the similarities with those 3 games. Been a while since I’ve played.

Across all three

• Shops
• House upgrades
• Fishing
• Crops
• Plant Trees
• Crafting
• Villagers relationship
• Selling
• Clothing
• Villagers quests
• Multiplayer

With Animal Crossing

• Tools break
• Museum
• Island Visitors
• Customise your island
• “3D”

With Stardew Valley

• Mines
• Ores
• Cooking
• Teleport
• Season crops
• Mobs
• Energy and health
• Raise animals

Dinkum only

• Vehicles
• Capture wildlife
• Metal detecting
• Gliders

There are probably more similarities but these are the ones off the top of my head.