Yes, there is a difference. The total coverage amount is the total sum assured for the early critical illness, where as the total claim amount is the payout amount per claim, usually capped at for example, $250, 000 or a maximum of $350, 000, depending on the individual insurer.
For instance, depending on the individual insurer, the claim limit for Aviva is at $250, 000 and for some insurers like AXA and Tokio Marine they are at $350, 000, per early critical illness diagnosis claim. The total coverage limit for AXA is at $3, 000,000 and this means early critical illness diagnosis coverage is limited at $350, 000 per payout, it can be covered for more than twice that claim limit.m