What does the poet mean when he says ' treat them just the same'?

In the poem "If" by Kipling, the speaker states that we
should treat the two imposters the same:

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If you can meet with triumph and disaster

And treat those two imposters just the
same;

The speaker is stating
that triumph and disaster are the both imposters. This means that triumph may not be
a victorious moment in which to celebrate. Hitler was triumphant, but his victory was
really a disaster. In this way of looking at triumph, it is easy to see that Hitler's
triumphant victory was an imposter. He celebrated a horrible event. Ultimately, his
triumph changed to defeat. When the Americans moved in on his soldiers, he lost the
battle and ended his life in suicide.

Disaster can be
determined an imposter as well. When something tragic is turned around for good, the end
result can be a blessing (Romans: 8:28). Suppose a person loses his home in fire, the
second home can be built much nicer and more spacious. This terrible beginning can have
a happy ending. In this way, disaster can be turned into a
blessing.

What the speaker is saying is that the reader
should be careful in his or her interpretation of any event. What appears to be a
triumph can really be a disaster, and what appears to be a disaster can really be a
blessing. Therefore, the speaker's suggestion is to treat both triumph and disaster the
same. It is up to the reader to interpret both imposters for what they
are.