Do I need matching RAM in each slot when upgrading from 2GB to 3GB?

Hi there,
I am looking to upgrade my RAM (see my computer specs below). My MBP has 2x1GB sticks installed. The limit on my machine is 3GB so I only need to replace one of the slots with a 2GB stick. However I've heard that it's recommended to get all the RAM from the same supplier - is that right? Meaning am I better off buying a 3GB kit? I was thinking of purchasing OWC or Crucial brand. Any other recommendations between the two brands?
Here are my specs:
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro2,2
Processor Name: Intel Core 2 Duo
Processor Speed: 2.33 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP22.00A5.B07
Thank you in advance!
Supriya

Note that you can install 2 x 2 GB sticks. That will give you the (marginal) benefit of a matched pair. Your machine will report in About this Mac that you have 4 GB installed - in fact, your system will only use ~3.2 GB of the RAM (a little more than the 3 GB 'stated' max, but not the full amount installed).
Several months ago, this clearly wasn't worth it - but the price of a pair of 2 GB sticks has come down sufficiently that you may consider that option.

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