Is it a conflict of interest to work for two different companies offering the same services if no sales are involved or information exchanged?

Is it a conflict of interest to work for two different companies offering the same services if no sales are involved or information exchanged?
Whether or not the information is actually exchanged the fact that it available to an individual capable of mixing two different companies techniques and information is usually considered a conflict of interests because there is no way to determine where this individuals true loyalty lies between the two companies.