The SHIFT phones in the series do not share a device codename,
| Retail Branding | Marketing Name | Device | Model |
|---|---|---|---|
| SHIFT | SHIFT6m | SHIFT6m | SHIFT6m |
| SHIFT | SHIFT6mq | axolotl | SHIFT6mq |
| SHIFT | SHIFTphone 8 | otter | SHIFTphone 8 |
so, no, the builds for SHIFT6m / 6mq are not interchangeable.