two different concepts

I am not sure what your position is in this firm. but capital contribution is your contribution to the firm, if the firm is at a loss, you lose too. if your firm makes a profit, you will get some distribution probably based on the proportion by your contribution, but that is usually for partner or S-Corp. Sound you just need pay deposit, deposit can be refundable or nonrefundable. your information is not very clear. Anyway, just ask them before signature, this is refundable deposit or not, let them change if yes.