Well, your true draw length should not change. Other than the compression of the arms and shoulder is greater when shooting traditional due to the increased poundage at anchor.
However, short a2a bows and the ever growing demand for speed encourages many archers to shoot draw lengths a bit longer than their true draw length. In traditional bows the bow must conform to the archers personal draw length and anchor point. With compound bows the archer must conform to the bow regardless of draw length. So even though the physical dimensions of the archer do not change the body can be manipulated to lengthen or shorten a draw length to fit the compound whereas the traditional bow must be manipulated to fit the archer.
It is a common problem amongst modern archers to place the release aid too far out on the finger tip. Other than closed body position and bow grip pressure this is probably the issue I see most when first teaching the art of proper form. When the release is properly placed near the middle knuckle of the finger the string position should find the same vertical anchor as you would have shooting fingers. There are minor differences due to different hook to trigger lengths, but those are minimal at best.
Far too many traditional archers short draw their bows. Usually a result of being unable to comfortably anchor the full draw weight. Other reasons tend to be the cockamamie over bent, attack the target, out of balance traditional form many traditionalist's practice and thus give advise on. Does not matter what weapon you chose to shoot your body should never be out of balance and your spine should be in line with the space between your feet.
So, when proper form is addressed and proper fitting of a bow is employed all draw lengths should be the same regardless of traditional, compound, fingers or release. Only variance should be the amount of loose jointed compression your body exhibits to the amount of draw weight being placed on the body. Never more than 1/2 inch.
