Every time you create a BlocklyProp project, you are prompted to choose a board type. The board type setting changes:
Each set of blocks is custom-fit to work well with the built-in accessory circuits on its particular board. This helps to avoid accidentally misusing the I/O pins connected to a board's accessory circuits.
Can I change my project's board type? — NO! Once you have created a project, you cannot change the board type chosen.
Can I upload a blocks file from one board type into a project for another board type? — MAYBE. If you try to upload a BlocklyProp Project .svg file to a project of a different board type, you will see an error message. You can override the message and proceed, but the operation is still likely to fail unless all of the blocks in the project are 100% identical in functionality between the two board types. It is usually best to view the .svg file as a reference for re-building the project with the correct board type.
Propeller Activity Board WX Guide [1] Propeller Activity Board Guide [2]
These all-purpose boards have almost no built-in accessory circuits.
Propeller FLiP Guide [3] Propeller Project Board USB Guide [4]
Hackable Electronic Badge Guide [7]
"Other" is the catch-all category for boards with a Propeller P8X32A microcontroller module that is not otherwise on the list. There are three major differences in this category:
The System category of blocks generally requires some familiarity with text-based programming and the Propeller P8X32A chip architecture for successful use.
Links
[1] https://www.parallax.com/downloads/propeller-activity-board-wx-product-guide
[2] https://www.parallax.com/downloads/propeller-activity-board-guide
[3] https://www.parallax.com/downloads/propeller-flip-module-product-guide
[4] https://www.parallax.com/downloads/propeller-project-board-usb-product-guide
[5] http://learn.parallax.com/support/reference/scribbler-3-robot-block-reference
[6] https://www.parallax.com/downloads/scribbler-s3-robot-info-poster
[7] https://www.parallax.com/downloads/hackable-electronic-badge-product-guide
[8] https://www.parallax.com/downloads/badge-wx-product-guide
[9] https://www.parallax.com/downloads/p8x32a-propeller-datasheet