@kamsi

It's the right specs, and it has a really high capacity rating. I would note though, that unless you see people that actually tested the capacity, they often overinflate the numbers. They even do so with the individual cells on these sites, if you were looking to build your own battery pack. The components used sometimes aren't the best inside, using nickel plated vs pure nickel, quality of the solder and BMS. In reality, you're using it as a second battery, especially if it's in parallel, it will have less strain on each prolonging the life. You can help by also wrapping some foam or something around your batteries so they don't shake so much in the compartment. 

How much are these running for? 

@kamsi

what do you want to do?
More power?More range? Paralleling the battery with your original one?

The stats you showed aren´t saying much but that this 3rd party battery has 10Ah more capacity than the original one(which is nice).
What´s the price of that pack, including shipping to your location?

@kamsi
You won't really get a boost in power with high ah battery. You can use a pack with different capacity being that they both have BMS that should keep them even when they are in parallel with each other. While you don't get higher power, you will go much further before feeling the power dip from your battery levels dropping. A way to think is your battery has a max charge of 71.4 volts (17s battery) and at 40 amps (the max the controller will pull) you achieve 2856 watts. The further you get away from the 71.4 volts, the further you are from the 'peak' 3000watts. 

If your electricity is a bucket of water, the distance from the drain to the top is the volts, determining how much pressure there can be. The amps is the tube going out or how much water can flow through at one time. The amp hours (ah) is digging your reservoir sideways. You're not impacting the pressure or how much can flow through at onceby adding the pack in parallel, you're digging sideways to have more water before you run out and adding a second pipe so you only need half to pass through each connection in order to achieve the same volume. 

The benefits of this will also include less strain on your battery. If you discharge and charge fewer times, the better. Having batteries in parallel will pull fewer amps from each to achieve max power which is better on strain, but also keeping things further below their max rating reduces losses in the system and heat given off. both good things.