To be honest...off the top of my head...I don't know what an ACC1 or ACC2 sensor is (is it something to do with adaptive cruise control?). But both should have an 11 digit BMW part number....and every online part database that I've ever used has a part number search feature.
You can easily look up the part you are referring to and then click on the part number on whatever partdatabse site you use...and it should list all of the other BMW models that use the same part. Also, check the TO/FROM or DATE supplemental columns to see if they have a production date range listed for use of the part number.
Below are three of my favorite online part database sites (feel free to bookmark/save them for future reference)...just type in the last 7 digits of your VIN, then browse the diagrams to find the ACC1 & ACC2 sensors (or utilize the part number search box)...then check if these sensors are restricted to certain build date ranges...or if they are retro-actively exchangeable:
After doing some searching with the assumption that this was something related to active cruise control...it appears (based on the part database) that the ACC2 sensor is used with production dates starting with March 2005-upward. The ACC1 sensor is used for the e65 740d produced prior to March 2005. If you're going to replace your ACC sensor...I would suggest replacing it with an ACC1 sensor. Click the links below to go directly to the part database part number index for item #1 in the diagram and take note of the DATE column to see what production date range the item can be used with:
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