I don't know 100% yet, but visually (which I don't trust, cause could be bd), and through repeated self-measurement (which can be inaccurate, but I've measured a lot, multiple times now with different methods from tape measure, marking wall, myself, etc) my femur seems to be measured longer than my tibia? If I measure from my hip-bone then yes my femur is longer, but x-rays show that the femur starts around the middle of the pelvis/not the hip bone, so I chose an approximate location that I feel like I can feel my femur at, and got around a ~3-4cm difference between my femur and tibia.

If I chose to go lengthening on the tibia, would it cause any problems? I don't really care about visual proportions because not everyone is proportionate anyways, and most people won't notice, plus I can adjust my clothing. Mostly wondering about potential health issues like arthritis, or any other joint/bone problems due to irregularities in proportions. Or is it nothing to really worry about when lengthening?