are they the same? not at all.
NB... made in Germany
HP.... Made in Australia, assembled in the USA

let me tell you, if you are looking for 46 to 50 2-stroke power, and want a good 2-stroke, go over to RCG and buy yourself an HB 61PDP chrome engine, even start a "wanted post" in the engine classified), you will see the side of it's Mounting Tab is chrome and says PDP, these engine depending on what Carb and what Prop Hub should weigh some 2oz to 3oz lighter than the 61FX yet will pull a 11x10 or 12X6 better than a 46 or 50 will . I would sell you mine (NIB) that I have had for some 12 years now, but I just can not bring myself to do such a thing yet, because I feel it's worth more than what they are selling for, you should be able to find one NIB for $125 to $140, maybe $150 shipped and even less than $100 for a hardly used one.. my HP well never sell LOL

Jim