There are certainly similarities, but I feel that with a startup there are some different expectations. For example since I get (a small amount of) stock options, and it is a small company it would not have a large amount of cash stored in the bank the counterargument to me asking for a raise might just be "we are already paying you enough and we cannot afford any more".

The other distinction is that we have no dedicated HR staff so I'll be negotiating directly with the CFO.