A good tear down video of a BT3100 which is very similar to the BT3000 except that it uses the thicker black shims.
This picture shows the difference between new BT3100 shims on the left and old BT3000 shim on the right. They are not interchangeable. You can upgrade the saw to use the newer shims but you would have to find a replacement part for the guide holder (0181010110). I have heard there is mixed results with this approach.
Note: I have been asked if the flat shims are any different between the BT3000 and the BT3100. My conclusion is that they are the same based upon this reference page: https://mastertoolrepair.com/10-in-table-saw-parts-bt3100-p-802397.html
Flat shims for the BT3100 are listed as the same part number as the BT3000 and referenced as the shims for the BT3000.