Yes, plastids are interchangeable in their form.

There are three types of plastids - Chloroplasts (green colour), Chromoplasts (red, yellow, orange colour), Leucoplasts (Colourless). Depending upon different circumstances, these plastids interchange.

For example -

• The colour of green tomatoes changes to red due to replacement of chloroplasts with chromoplasts.

• The stem tuber of potato has leucoplasts but when exposed to sunlight, the leucoplasts are replaced by the chromoplasts.