My sister (not a veg*n) unknowingly used silken tofu instead of firm tofu in some muffins that she made for me. They had a slightly different consistency than other vegan muffins that I have had, maybe a bit moister. They were still quite delicious and quite popular with me and my non-veg*n family. I'd think you're probably safe with the substitution.
The recipe actually calls for firm silken tofu - not regular firm. I haven't seen anything called firm silken, but haven't looked either.
I would think to add maybe an extra teaspoon cornstarch, and be sure to press out the water.
Now subbing reg tofu for silken I think would be a mistake.
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