The short answer is No. Web application and mobile application is 2 different things in term of development, user experience and delivery or if really want to compare all the aspects, at least for my understanding.
But, the long answer is it depend, if your "mobile" application is just some information application or not so complicated and may be just a push notification then PWA is good enough to achieved it.
perhaps in your case, you may convert your existing application into PWA ready until you find it is necessary to be mobile application then only reconsider it. at least it buy you some times and experience to explore/learn more.
https://medium.com/@IO_/https-medium-com-io-building-progressive-web-apps-with-laravel-57f6bfa3ddb1
perhaps you can also read more about PWA, this link below may useful for you to understand more: https://medium.com/@deepusnath/4-points-to-keep-in-mind-before-introducing-progressive-web-apps-pwa-to-your-team-8dc66bcf6011