Equity split as part time cofounder (I will not promote)

Really need some help thinking about this: original founder built most of the product, found me (product) and the other cofounder (technical) almost a year after initially starting, where I worked to redo key parts of the UX + UI, did rounds of beta and refinements, and will be relied on for most of the initial and continued customer acquisition. Working about 20 hours most weeks on this, technical cofounder working probs 10-15. We are both given 16.5% equity (didn’t sign anything yet) does this sound right? How to think about it ? The original founder is not technical but built the product with help and also still participates in build right now (makes me feel weird about having same cut as the other technical founder) original founder also participates in product direction and some design, so part of their reasoning for wanting to keep their 55%.