I just wanted to say welcome to TE. If you search a bit, you will find lots of info for shorter riders. But I can answer your question. Each bike manufacturer makes a slightly different bike. It's very common for a 44 from one company to be a different SIZE from a 44 in another. For one thing just because the stand over is the same, it doesn't mean that the top tube (reach) is the same or vice versa..
You just have to try a lot of bikes and if you're lucky, you will find one that fits.