Hey, I was wondering if the teks stay exactly the same with bulk extractions vs small extractions?

I've been using cybs salt tek (twice) pretty successfully but it only uses 50g per extraction.

If I want to do 200g should I just multiply everything in the ten by 4?

Most (all?) teks it is just a case of scaling it up, yes.

If it is your first try I would advise not using all your supplies at once (not that I went that route). Amounts will be far easier to deal with and if it goes wrong you can improve on it in the next extraction.

There is a ratio of water to bark with stb that you should keep when scaling up for best results.
15ml water per gram of bark & 1g lye per gram of bark.
Salt should be scaled up following the ratio of salt to water in the tek.
Naphtha should stay around 0.5-1ml per gram of bark material but does not effect yeild much because excess naphtha can always be evaporated down.

Nexus FAQ says scaling is alright. IIRC I have seen cyb state that simple linear scaling of materials in his/her tek will not yield optimal results. Personally I stick to teks pretty strictly so I cannot give definite advice here.

One thing I wouldn't do in your case though is quadruple your NP solvent, that would be too much I think.

That's a bit annoying. Whatever I bought 500g of ACRB and am planning to do thick lights tek. Looks promising.