Using the Lahiri Ayanamsha, the two Zodiacs coincided at 285 AD. The difference between the Zodiacs grows by about one degree every 72 years.
Today, the difference between them is approximately 24 degrees. E.g. a planet at 25 degrees of Cancer in a Western chart is at about 1 degree of Cancer Sidereally, and any planet earlier than 24 degrees of any Tropical sign will move back to the previous Sidereal sign.
This divergence continues to increase, and therefore astrologers are having to come to terms with planets being in one sign Tropically and another one Sidereally. Nevertheless, each Zodiac has exceptional value within the astrological system in which it is used.