Based on the information available, it is possible to experience similar side effects from Cosentyx and a flu shot, but the specific side effects can vary.

Cosentyx (secukinumab) is a medication used to treat several conditions, including plaque psoriasis, psoriatic arthritis, and ankylosing spondylitis. Common side effects of Cosentyx include cold symptoms such as runny or stuffy nose, sore throat, and sneezing; diarrhea; and upper respiratory tract infections [1].

On the other hand, a flu shot is a vaccine that helps protect against the flu. Common side effects of a flu shot include soreness, redness, or swelling where the shot was given; hoarseness; sore, red, or itchy eyes; cough; fever; and aches [2].

While there is some overlap in the side effects of Cosentyx and a flu shot, such as aches and respiratory symptoms, it is important to note that the specific side effects and their severity can vary. Additionally, the active ingredients in Cosentyx and a flu shot are different, which can also affect the side effects experienced.

It is always recommended to consult with a healthcare provider for personalized medical advice.

Sources:
[1] <https://www.drugpatentwatch.com/drugs/cosentyx>
[2] <https://www.cdc.gov/flu/prevent/vaccinations.htm>