> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bedrock.cv/llms.txt
> Use this file to discover all available pages before exploring further.

# Compare drawings

> Compare all matching sheets between two drawing revisions.

Compare all matching sheets between two drawing revisions. Sheets are matched by sheet number, and overlays are created for each matched pair.

## What Happens Next

1. Sheets are matched by sheet number (e.g., A-101 in both drawings)
2. For each matched sheet pair, blocks are compared
3. [Overlays](/cms-api/resources/overlays) are created for each block comparison
4. The job completes when all comparisons finish

Poll [`GET /jobs/{id}`](/cms-api/jobs/get) to track progress. Once complete, use [`GET /overlays?job_id={id}`](/cms-api/overlays/list) to retrieve the results.

## Sheet Matching

Sheets are matched by their `sheet_number` field:

| Source Sheet | Target Sheet | Result |
| - | - | - |
| A-101 | A-101 | Compared |
| A-102 | A-102 | Compared |
| A-103 | (missing) | Skipped |
| (missing) | A-104 | Skipped |

To compare sheets with different numbers, use [Compare Sheets](/cms-api/overlays/compare-sheets) instead.


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