Yes they are, 160kts IAS to 4 dme (see other recent thread). However the original poster said the info screen on the plane showed the aircraft flying a ground speed of 160 kts. Autothrottle mentioned the reason for the go-around was because the aircraft was still flying around 200kts IAS (with 40 knot headwind = 160 kts ground speed) with the preceding aircraft probably adhering to the 160kts IAS instruction (approx 120kts ground speed).