Player fired wind charge can only making player jumps about only 2.5 blocks high, breeze wind charge can making player jumps about 5 blocks high.
The changelog says:
A Wind Charge fired by a player will grant 10% more knockback than a Breeze's, but have a much smaller area of impact
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I can't confidently confirm this in it's entirity, because there are many factors at play here for how much knockback the player takes, and what the context is. From my test, I can confirm that the player is only knocked about 2.5 blocks upwards with a thrown wind charge item, but that yeilds a different result when the wind charge is summoned instead and attacked to boost the player upwards as much as 5.5 blocks. If the player throws the charge and jumps at the correct time, they can be knocked back as much as 8.5 blocks. As the previous comment pointed out, the difference in AoE probably plays a part in the observed difference in the knockback, and the 10% increase is likely present to make up for that. Also, with the difference in a breeze wind charge vs. a regular wind charge, it's unclear in the first place if the two are meant to exactly match each other in how far they knockback the player considering their different gameplay usage.
Difference in thrown charge, summoned wind charge, and summoned breeze charge:
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Throwing a charge + jumping
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Since I don't know the exact intended knockback numbers of the different charges, I can confirm the fact that without jumping, player thrown wind charges do not exactly match summoned a breeze wind charge as described in the issue. I think ultimately it'd be best to see what Mojang thinks of the differences in the numbers shown here, and decide if it's WAI or not.

jumping and trowing a wind charge at the same time makes the player go 8 blocks or more in the air

This works as intended
Patch Notes from 24w06a;
Experimental Features
Wind Charge
Become the Breeze! Using a Wind Charge will fire off a wind charge projectile similar to the Breeze's
A Wind Charge fired by a player will grant 10% more knockback than a Breeze's, but have a much smaller area of impact
Just like the projectile fired by the Breeze, Wind Charges fired by the player also deal damage if they hit an entity directly
The Breeze drops between 4-6 Wind Charges when killed
There is a half-second cooldown after each use
Wind Charges can be fired from a dispenser
Players that launch themselves with a wind charge only accumulate fall damage below the y-level of where they collided with the wind burst
I'm not sure how the code works but what I think is happening here is, the player wind charge does have the 10% knockback increment, however due to the breeze wind charge having an extended area of effect, the knockback is probably more powerful if the entity is very close to the center of the explosion.
But that's just an hypothesis.