Not so much. mars and venus rest at entirely different redox states than earth. One has a lot more atmostphere than the other, but chemically they’re kinda dead. If we looked at us with current tech I am not entirely sure what we would find. We could notice the general chemistry from reflections and spectography. We would see that earth is way out balance compared to what it would be sans life actively using energy to convert compounds to other compounds. We don’t have to assume oxygen to notice the redox potential of earth is quite different from the others we have seen, and we know we can attribute that to life processes over billions of years.
This link gets at the instrumentation, although i think it assumes ‘life as we know it’. I know first hand that the folks who professionally look for life on other planets don’t assume it would be identical to what we have here, not at all, but it likely will leave markers of some sort.
