What Mood do you mean? In the first example you used Indicative, but in the second one you switched suddenly to Subjunctive.Okay thanks. What about past tense? Like "I could have done that as well", again same context, but personally choosing not to.
Your variants aren't appropriate for all contexts. The most neutral and default translation of "I can do it as well" without any surroundings is "я тоже могу это сделать".In my opinion the more natural translations are Я тоже так умею for indicative and Я бы тоже так смог for subjunctive.