The 13 Digital and 6 Analog pins are the same on the Lillypad and UNO.
If you are feeding the UNO with 5V (or more) and expecting 3.3v out of the 3.3V pin you will need to find another way to power things. The lillypad usually uses a battery pack with an output in the range 2.7V to 5.5V. If you NEED 5V you can use a higher voltage battery pack and a voltage regulator. Once you have 5V you can add another regulator to get 3.3V.