The previous puzzle used the singular and was “easy”. This one BIRDS + BIRDS = FLOCK has more solutions, but I’d classify it as slightly harder than the previous one.
Enjoy! Solutions are below the image.
SPOILER SOLUTIONS!
| BIRDS_first | BIRDS_second | FLOCK_third |
|---|---|---|
| 13485 | 13485 | 26970 |
| 13548 | 13548 | 27096 |
| 13845 | 13845 | 27690 |
| 14538 | 14538 | 29076 |
| 14685 | 14685 | 29370 |
| 14835 | 14835 | 29670 |
| 14853 | 14853 | 29706 |
| 14865 | 14865 | 29730 |
| 15486 | 15486 | 30972 |
| 16485 | 16485 | 32970 |
| 18546 | 18546 | 37092 |
| 18645 | 18645 | 37290 |
| 20679 | 20679 | 41358 |
| 20769 | 20769 | 41538 |
| 20793 | 20793 | 41586 |
| 23079 | 23079 | 46158 |
| 26709 | 26709 | 53418 |
| 26907 | 26907 | 53814 |
| 27069 | 27069 | 54138 |
| 27093 | 27093 | 54186 |
| 27309 | 27309 | 54618 |
| 29067 | 29067 | 58134 |
| 29073 | 29073 | 58146 |
| 29307 | 29307 | 58614 |
| 30729 | 30729 | 61458 |
| 30792 | 30792 | 61584 |
| 30927 | 30927 | 61854 |
| 31485 | 31485 | 62970 |
| 32079 | 32079 | 64158 |
| 32709 | 32709 | 65418 |
| 32907 | 32907 | 65814 |
| 34851 | 34851 | 69702 |
| 35148 | 35148 | 70296 |
| 35481 | 35481 | 70962 |
| 38145 | 38145 | 76290 |
| 38451 | 38451 | 76902 |
| 45138 | 45138 | 90276 |
| 45186 | 45186 | 90372 |
| 45381 | 45381 | 90762 |
| 46185 | 46185 | 92370 |
| 46851 | 46851 | 93702 |
| 48135 | 48135 | 96270 |
| 48351 | 48351 | 96702 |
| 48513 | 48513 | 97026 |
| 48516 | 48516 | 97032 |
| 48531 | 48531 | 97062 |
| 48615 | 48615 | 97230 |
| 48651 | 48651 | 97302 |