"Concept" Boba Fett

2 sub-variants

"McQuarrie Concept" Boba Fett

"McQuarrie/Johnston Concept" Boba Fett

One early sketch talks about the knee darts being able to fire in either direction - front or back

"Prototype" Boba Fett

"Animated" Boba Fett

2 sub-variants

"Holiday" Boba Fett

"Droids" Boba Fett

"Pre-Pro" Boba Fett

5 sub-variants

"Pre-Pro #1" Boba Fett

Same or very similar as the ESB knees

"Pre-Pro #2" Boba Fett

"Pre-Pro #3" Boba Fett

"Promo #1" Boba Fett

"Promo #2" Boba Fett

"Empire" Boba Fett

Orange-yellow knee armor with two dart launchers on the left knee and one on the right

"Jedi" Boba Fett

Golden yellow knee armor with two dart launchers on the left knee and one on the right with a second metal detail above it (unlike ESB)

"Special Edition" Boba Fett

2 sub-variants

"Return of the Jedi: Special Edition" Boba Fett

Right knee armor is from the pre-production costume

Source: MiggsFett

"Star Wars: Special Edition" Boba Fett

"Post-Sarlacc" Boba Fett

4 sub-variants

"Post-Sarlacc" 1 Armor (Cobb Vanth)

No left knee armor - lost in the Sarlacc

Source: "The Book of Boba Fett" Chapter 1

"Post-Sarlacc" 2 Cloaked Figure

None

"Post-Sarlacc" 3 Armor with Robes

Moved to shin armor above a tall boot, it's just one on his right shin and fires two rocket darts on either side rather than just one side

"Re-Armored" Boba Fett

"The Book of Boba Fett" Boba Fett

2 sub-variants

"Daimyo" Boba Fett

Moved to shin armor above a tall boot and back to having two of them unlike in "The Mandalorian" Season 2

"Flight Suit" Boba Fett

"Kamino" Jango Fett

Knee armor plus thigh and shin armor

"ATTACK: With mini-rocket launchers fitted into his knee guards and sobre dart firers in his right gauntlet, Jango had plenty of surprises to spring on unwary opponents."

"Arena" Jango Fett

Knee armor plus thigh and shin armor