Hi, from what i see, that Alza PC uses their inhouse brand of case, which i dont have any meaningful info to speak of and it uses Endorfy Fera 5 air cooler instead of Endorfy Navis watercooling in ours. Otherwise yes, theyre quite comparable. They have indeed stronger GPU, but from what i see, there only specified Nvidia RTX 4070 Ti SUPER in general - that probably means, you can get edition based on their current internal options.
Its common step now, because some RTX 40 GPUs are more and more in short supply - we do that sometimes too with condition that the switched GPU edition is equal or better than the default one - cant speak how Alza does it tho, I work for HAL3000, not for Alza.
And yes we (HAL3000) sometimes are a bit or two pricier and sometimes cheaper, depends on many conditions. We currently have
https://www.alza.cz/hal3000-online-gamer-4070-super-d12358614.htm with 4000 CZK off, making this one a really good pick, but yeah, in 4070 TI SUPER range we are bit pricier.