No, certainly not. It's very difficult to imagine any scenario like that resulting in any impact on the Canadian election, or a person who would commit such fraud being motivated significantly to do so, given their knowledge that it would have essentially no impact.
To take this a little further, the degree to which the notion of individual voter fraud by people living abroad, to think about how absurd it is but on the flip side how strong the barrier would be, it would be unimaginable for the political parties to create a situation whereby nobody could donate to them during an election period unless they had registered for the opportunity to donate to them prior to the election period. There is no chance that any political party would accept that kind of situation because they would understand that it would create an unnecessary and unreasonable barrier to people participating.
The barriers that are being created here are very strong, while the problem that's being imagined is essentially non-existent.