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Varieties with a similar appearance
Congo
| Characters compared | Value |
| Maturity: | Late |
| Flower colour: | White |
| Light sprout colour: | Blue |
| Tuber skin colour: | Blue |
| Tuber eye colour: | Blue |
| Primary tuber flesh colour: | Blue |
| Tuber shape: | Long to oval |
| Variety | Characters matched | Sources |
| Congo | 7/7 | 2 |
| Edgecote Purple | 5/7 | 4 |
| Blaue Schweden | 5/7 | 2 |
| Long Blue | 5/7 | 2 |
| Peru Purple | 5/7 | 1 |
| Shetland Unfoermig Blau | 5/7 | 1 |
| Blue Marker | 5/7 | 1 |
