What's the difference between a travel crib and a pack'n'play?

The main difference is that travel cribs fold up small, are compact (some fit in their own backpack or in a plane's overhead locker) and are much lighter than a standard pack n play.

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Graco Pack 'n Play Portable Playard : Target

Gladly designed the ultimate portable playard, suitable for use from birth and beyond. It folds in a flash with just one hand and includes a backpack-style storage bag. With a breathable mesh surround and a comfortable, supportive mattress, your little one can sleep or play anywhere you can set it up. The adjustable bassinet is perfect for newborns and can be used for in-room sleeping.

Gladly Family Merritt Travel Crib & Playard

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Pack n play vs mini crib vs bassinet vs travel crib - January 2021 Babies, Forums

10 best pack and plays and travel cribs, per experts